/**
* Copyright (C) 2013-2024 Nanjing Pengyun Network Technology Co., Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/ 

package py.datanode.segment.datalog;

import java.io.IOException;
import org.apache.commons.lang.NotImplementedException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import py.archive.segment.SegId;
import py.common.struct.Pair;

public class MutationLogEntryReaderCompactImplForPersistedLogs extends
    MutationLogEntryReaderCompactImpl {
  private static final Logger logger = LoggerFactory
      .getLogger(MutationLogEntryReaderCompactImplForPersistedLogs.class);

  @Override
  public MutationLogEntry read() throws IOException {
    super.readInteral();

    if (status != MutationLogEntry.LogStatus.AbortedConfirmed
        && status != MutationLogEntry.LogStatus.Committed) {
      logger.error("persisted log {} {} can't be other status except Committed or AbortedConfirmed",
          logId, status);
      throw new RuntimeException();
    }

    if (eof) {
      return null;
    } else {
      MutationLogEntry logEntry = MutationLogEntryFactory
          .createEmptyLog(uuid, logId, offset, checksum, length);
      logEntry.setStatus(status);
      logEntry.apply();
      logEntry.setPersisted();
      return logEntry;
    }
  }

  @Override
  protected MutationLogEntrySerializationCompactFormat.FieldType[] getFormat() {
    return MutationLogEntrySerializationCompactFormat.fieldsInOrderForPersistedLogs;
  }

  @Override
  public Pair<SegId, MutationLogEntry> readLogAndSegment() throws IOException {
    throw new NotImplementedException("");
  }
}
